[LBBS-142] io_compress: File descriptor 0 closed unintentionally

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If setup aborts part way through, we end up closing file descriptor 0:

[2026-03-07 15:02:56.352]   ERROR[3882981]: io_compress.c:247 setup: pipe failed: Too many open files
[2026-03-07 15:02:56.352] WARNING[3882981]: fd.c:394 __bbs_close: Attempting to close file descriptor 0 at io_compress.c:270 (setup)
[2026-03-07 15:02:56.353]   ERROR[3882981]: backtrace.c:255 bbs_log_backtrace: Got 11 backtrace records
[2026-03-07 15:02:56.370]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  0: lbbs bbs_log_backtrace()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  1: lbbs __bbs_close()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  2: [0x7f887006ef1b] io_compress.so                       io_compress.c:270   setup()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  3: lbbs bbs_io_transform_setup()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  4: [0x7f88597e8fa3] net_imap.so                             net_imap.c:4982  imap_process()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  5: [0x7f88597e9f2e] net_imap.so                             net_imap.c:5071  handle_client()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  6: [0x7f88597ea17d] net_imap.so                             net_imap.c:5105  imap_handler()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  7: [0x7f88597ea40f] net_imap.so                             net_imap.c:5129  __imap_handler()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  8: lbbs <unknown>()
[2026-03-07 15:02:56.371]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace:  9: [0x7f887b3351f5] libc.so.6                                         :0     pthread_condattr_setpshared()
[2026-03-07 15:02:56.372]   ERROR[3882981]: backtrace.c:279 bbs_log_backtrace: 10: [0x7f887b3b58dc] libc.so.6                                         :0     __xmknodat()

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